Sealed poly in Passive Crawlspace System I remember the first membrane my partner installed, I had left him alone, to do the work, on the last day, I got a panic call from, him, saying the membrane is rising off the floor- what do I do- I laughed and said: Perfect, means your seal is perfect- plug in the fan.
By the time, I got off the phone, the membrane was tight to the ground.
Maybe not a direct answer to your question, but it’s all about air pressure and which one, is stronger.
We never leave poly exposed, we only use Fire/ smoke rated products.